Collinear cable example with intermediate support

[Anonymous]

To whom it may concern,

I am currently trying to use cable elements in a simple robot model however I am battling to obtain solution convergence of the assembly.

Essentially I want to model a cable which has a pretension of 1000 kN in it. The cable is has an intermediate elastic support in the vertical direction and is pinned at either end. The cable has been divided into to such that the intermediate support may be modeled making the cables collinear. Additionally, uniform loads are applied to the cables.

Please be so kind as to offer advise, urgently.

I have attached the example for reference.

Regards,

Dane

[Artur.Kosakowski]

Hi @Anonymous

Here you are:

 

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

Hi @Artur.Kosakowski,

I did as indicated however, there is a strange displacement occurring on the right hand side. Note that our max displacements are the same.

 

Regards

Dane

[Artur.Kosakowski]

Hi @Anonymous

You display the shape with large scale therefore its shape due to the horizontal displacement of the support gets strange shape. You may want to display it in the structure scale instead:

 

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

Hi @Artur.Kosakowski,

Thank you for the assistance.

Please could you explain to me why there would be such a large displacement in the UX direction?

If this were a uniform cable resting on an elastic support I typically wouldn't expect this. Could this be as a result of the cable definition and how I have applied the initial prestress of 1000 kN?

Regards

Dane 

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

I think so. To keep exactly 1000 kN in both cables is difficult. As we always recommend I'd rather use elongation instead.

 

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

Hi @Artur.Kosakowski

Thank you for the quick response and answering my question.

The quick response is much appreciated.

Regards

Dane